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  2. Readme Information for Oracle Database 12c Release 2 (12.2)
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  4. Database Upgrade Assistant (DBUA) Known Bugs

2.13.1 Database Upgrade Assistant (DBUA) Known Bugs

These are known bugs for Database Upgrade Assistant (DBUA) in Oracle Database 12c Release 2 (12.2).

2.13.1.1 Bug 24674586

During upgrade, the DBUA shows a prerequisite failure requesting that all underscore initialization parameters be dropped. If you drop the underscore initialization parameters from the SPFILE and continue the upgrade using DBUA without bouncing the database, the database instance fails to start up in upgrade mode.

Workaround:

Bounce the database after removing the underscore initialization parameters from SPFILE and then proceed with the DBUA.